208 THE ARCHITECTURE OFHUMANISM
tionsofthehumanbody,whichartists
like
Leonardo(followingVitruvius)soughttodescribewithinacircleand
a square, are
not most beautiful when
theycan be exactly related to those figures. It was
realised that
'proportion*is a formofbeauty
: itwasrealised that
'proportion'is amode
ofmathe-matics. Butit wasnot realised that thewordhas
adifferentbearinginthetwocases. Criticismis
not
called upon to invent an aesthetic for disembodied
minds,buttoexplainthepreferenceswhichwe(whose
minds are not disembodied) do actually possess.Ouraesthetic taste is
partly physical
;and, whilemathematical'proportion'belongs to the abstractintellect, aesthetic'proportion'is a
preference inbodilysensation.
Here,too,arelawsandratios,butof adifferentgeometry.And therecan benosure
criticism of architecture till we have
learnt thegeometryoftaste.Mass, Space, Line,
and Coherence constitute, inarchitecture,
the fourgreat provinces
of thatgeo-metry. Whenithassatisfiedscience
with'firmness,'andcommon use with
its commodity,
architecture,becoming art, achieves,
through these
four means,thelast'condition of well-building'—^its
'delight.'By thedirect agencyof
Massand Space,
Line andCoherence upon our
physical
consciousness, archi-tecture communicates its
value asan art.
Thesearethe irreducible
elementsofits
aestheticmethod.